The journal requirement is given in the course syllabus. The following is provided to help you figure out how to use your journal.
The purpose of the journal is to record your engineering experience.
Document your work and progress.
Record references for use later.
Prove to instructor that you're not a slacker.
``Play with'' ideas (even bad ones!).
Most every document, note and idea for the project must appear in the journal
please organize it well.
Your journal can be useful for doing archealogical digs.
What decisions were made when?
Who contributed what? (perhaps for patent purposes).
The instructor needs to be able to see how good it is in order to give you the grade you deserve!